The truck is a 1988 with the 2.3L and a 5 speed. Driving to work last week it died and wouldn't restart. Here is what I have done so far.


Spark is good, checked it and also it will run on starting fluid, making me chase the fuel path.

Volatge is good at the EEC.
Changed the Fuel pump relay, voltage at the fuel pump relay.
No voltage at the inertia switch, switch is operating normally.
Fuel pumps do not run.
No fuel in the rail.

I also jumpered the fuel pump relay to bypass it thinking I may have gotten a bad relay, no change.

Where do I go from here?

 

Fuel pump Fuse, it has it's own 30amp fuse, in the engine compartment Power box.

Power for fuel pump is

Battery------fuse-------FP Relay--------inertia switch------------fuel pumps-----ground

Fuel pump relay power is

battery-----EEC relay-----FP relay-------computer---ground

With key On there should be TWO 12v readings in FP relay socket, so 2 separate slots with 12v
With Key Off there should be 1 slot with 12v reading, that's the fused power directly from the battery

 

OK I am missing one of the 12V readings on the FP relay. Where is this power block in the engine compartment? All I see is fusible links.

Thank you

 

Thought they got the power box by '88?

If there are fusible links then it will have a yellow wire going to FP Relay, EEC relay also has yellow wire but separate fusible link.
The Fuel pump power is a Blue 20ga fusible link, same for the EEC relay

So
Battery---(red wire)-----blue 20ga fusible link-----(yellow wire)--------FP relay

You can replace it with a 30amp in-line fuse, if fusible links are not available, DO NOT run it unfused, if pump has a short and heats up you could have a VERY BAD DAY......................although you would have come up with a very easy way to remove the bed of the truck, and part of the cab as well

 

HAHAHA!!!!

Yeah it is fusible links. I will run down to the parts store and grab a fuse.

Thanks for the info.

 

Thanks again. Replace the fusible link with a fuse and she fired right up.

Now it is time to go tinker with my big truck.

 

Good work